IEICE Electronics Express
Online ISSN : 1349-2543
An X-Band Single-Layer Waveguide Directional Filter with Compact Size and Low Insertion Loss
Yun-Bo ZhangBin ChenCai-Zhang Ran
Author information
JOURNALS FREE ACCESS Advance online publication

Article ID: 15.20180826


A novel waveguide directional filter with compact-size and low insertion loss is proposed in this letter. The basic structure consists of a pair of rectangular waveguides placed parallel to each other along their narrow side and two identical band-pass filters connect them via two coupling slots. For easy of fabrication and assembling, all the band-pass filters and waveguides have a uniform height, that is all the components of the directional filter are in a single-layer waveguide. It is easy machining by standard computer numerical controlled (CNC) techniques to match the requirement for low cost. For verification purpose, an X-band single-layer waveguide directional filter has been manufactured and measured. The measured results show a insertion loss better than 0.1 dB, a return loss lower than -17.5 dB and a isolation better than -22.5 dB, good band-pass and band-elimination responses are also obtained over the frequency range from 7.25 GHz to 9.75 GHz. The good agreement has been found between the simulated and measured results.

Information related to the author
© 2018 by The Institute of Electronics, Information and Communication Engineers